| Year | Count |
|---|---|
| 1918 | 17 |
| 1921 | 5 |
| 1922 | 6 |
| 1924 | 5 |
| 1926 | 5 |
| 1928 | 162 |
| 1929 | 115 |
| 1930 | 22 |
| 1931 | 19 |
| 1932 | 64 |
| 1933 | 28 |
| 1934 | 15 |
| 1936 | 20 |
| 1937 | 32 |
| 1938 | 20 |
| 1939 | 31 |
| 1940 | 11 |
| 1941 | 5 |
| 1943 | 29 |
| 1945 | 6 |
| 1946 | 10 |
| 1947 | 23 |
| 1948 | 7 |
| 1949 | 27 |
| 1950 | 18 |
| 1951 | 69 |
| 1952 | 58 |
| 1953 | 84 |
| 1954 | 56 |
| 1955 | 133 |
| 1956 | 76 |
| 1957 | 79 |
| 1958 | 84 |
| 1959 | 82 |
| 1960 | 89 |
| 1961 | 83 |
| 1962 | 73 |
| 1963 | 97 |
| 1964 | 51 |
| 1965 | 64 |
| 1966 | 65 |
| 1967 | 116 |
| 1968 | 52 |
| 1969 | 67 |
| 1970 | 73 |
| 1971 | 44 |
| 1972 | 26 |
| 1973 | 6 |
| 1974 | 28 |
| 1975 | 10 |
| 1977 | 14 |
| 1979 | 5 |
| 1980 | 5 |
| 1982 | 6 |